Tank Mix Combinations of Glyphosate and Glufosinate in GlyTol Plus LibertyLink Cotton

Experiments were conducted in 2008 and 2009 to determine field tolerance GlyTol^TM plus LibertyLink^® cotton following applications of glyphosate (Roundup) and glufosinate ammonium (Ignite 280).  No adverse affects on plant establishment, plant height, maturity, vigor, and yield and quality were observed following any herbicide treatment.  Palmer amaranth (Amaranthus palmeri) and ivyleaf morningglory (Ipomoea hederaceae) control was evaluated following tank mix combinations of Roundup PowerMax and Ignite 280 when holding the rate of Roundup PowerMax at 1X and varying the amount of Ignite 280 added to the tank.  The rates of Ignite 280 were 1X (0.52 lb ai/A), 0.75X, 0.5X, or 0.25X.  For the second year, our studies suggest that a tank mix combination of Roundup PowerMax plus Ignite 280 may be antagonistic as far as Palmer amaranth control by Roundup PowerMax; however, this tank mix combination may improve the control of ivyleaf morningglory relative to either herbicide used alone.